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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 1426 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1446 or B1447 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X1 at the CIM.
  2. Test for greater than 15.5 V between terminals 13 and 14.
    • If less than specified value, test the B+ circuit and low reference circuit for an open/high resistance, short to ground or short to voltage. If the circuits test normal, replace the backup power source.
  3. If all circuits test normal, replace the CIM.
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